KR101040389B1 - Electric motor and manufacturing method of the same - Google Patents

Abstract

The present invention relates to an electric motor and a manufacturing method thereof in which the permanent magnet and the supporting frames are integrated with the yoke by resin molding to maximize structural stability, vibration resistance, and durability. An electric motor according to the present invention is an electric motor in which an armature coil of an armature assembly is disposed by maintaining a gap in a yoke assembly having a permanent magnet, the yoke assembly comprising: a yoke; A mold integrated field assembly disposed inside said yoke, said mold integrated field assembly comprising: a shielding ring fitted to an inner wall of said yoke; A four-pole permanent magnet coupled to the inner wall of the shield ring; Molten resin is injected while the shielding ring and the permanent magnet are combined to form a yoke molding in which the shielding ring and the permanent magnet are integrated with the resin. In the present invention, since the shielding ring and the permanent magnet or the shielding ring, the permanent magnet and the yoke are integrally formed by yoke molding, the shielding ring serves to prevent leakage of magnetic field as well as the frame supporting the permanent magnet. This reduces the number of parts, simplifies the assembly process, and further enhances vibration resistance as the permanent magnets do not shake or flow in the shielding ring, resulting in superior performance in harsh environments such as motorized power steering in automobiles.

Electric, motor, mold, integral, yoke, shield ring, permanent magnet, vibration, power steering

Description

ELECTRIC MOTOR AND MANUFACTURING METHOD OF THE SAME

The present invention relates to an electric motor and a method of manufacturing the same. More particularly, the permanent magnet and the support frame are integrated with the yoke by resin molding to maximize structural stability, vibration resistance, and durability, and thus can be used stably under harsh use conditions. In addition, the present invention relates to an electric motor and a method of manufacturing the same, which allow a simple structure and reduce the number of assembly operations.

In general, a brush type permanent magnet motor includes an armature assembly in which an armature coil is wound on a core of a rotating shaft, and a yoke assembly having permanent magnets. After placing and maintaining a void inside the permanent magnet of the yoke assembly, which is a stator, when a current is applied to the armature coil, an electromagnetic force is generated between the coil and the permanent magnet, and the armature assembly is rotated by Fleming's left hand law to obtain power.

For example, in the conventional electric motor disclosed in the Republic of Korea Patent Publication No. 10-058674 and the Republic of Korea Patent Publication No. 10-2008-0086806, etc., the permanent magnet is glued around the inside of the yoke in the form of a metal housing Attached.

In addition, when the thickness of the yoke is thin or the magnetic flux density of the permanent magnet is large, the thickness of the yoke is thickened to prevent the leakage of magnetic flux to the outside of the yoke, or a separate shielding ring (flux ring (Flux) Sometimes called ring)).

However, when the electric motor is applied to the harsh use environment, the permanent magnet or the shield ring is separated from the yoke and causes various problems.

In other words, the electric power steering device or power window device of an automobile receives the vibration of the engine or the road surface constantly. Under such severe conditions, the permanent magnet or the shielding ring is destroyed by the repeated and irregular vibration or sudden impact and the permanent magnet is damaged. The yoke may shake or the shield ring may break away from the yoke, or the permanent magnet may be damaged, resulting in loss of motor function.

1 to 4 illustrate a modification of an existing motor for application to harsh use conditions such as general use conditions or electric power steering devices of automobiles.

First, as shown in FIGS. 1 and 2, in the electric motor, the yoke assembly 10 is disposed on the inner wall of the yoke 20, which is a housing, and the inner wall of the yoke 20. Magnet 30, and the support frame 40 for maintaining and fixing the permanent magnet 30 at a predetermined interval.

The armature assembly 50 includes a core 52 that is integrally fixed to the rotation shaft 51, an armature coil 53 wound around a slot (not shown) of the core 52, and a rotation shaft 51. And a commutator 54 which is fixed integrally and to which the armature coil 53 is connected.

As shown in FIGS. 3 and 4, the support frame 40 of the yoke assembly 10 includes a skeleton magnet retainer 41 and four magnet protectors 42 coupled to the magnet retainer 41. It is made of, and is fixed to the inner wall surface of the yoke 20 in a state in which the permanent magnet 30 is coupled to each of the magnet protectors 42.

The yoke assembly 10 includes a permanent magnet 30 fitted to the magnet protector 42, a magnet protector 42 coupled to the permanent magnet 30 to the skeleton of the magnet retainer 41, and then a permanent magnet. The assembly process is complicated and demanding, as the assembly process is complicated and difficult, and the number of labor is increased.

In addition, since the number of parts of the yoke assembly 10 increases, the weight of the entire electric motor increases, which makes it difficult to apply the fuel efficiency to the place where the fuel economy is to be considered.

In addition, since play is likely to occur between the magnet retainer 41 and the permanent magnet 30, when applied to a place where the influence of vibration is continuously and repeatedly, such as a power steering motor of an automobile, the play is permanent. Since the magnet 30 shakes finely, there is a problem such as being a direct cause of noise generation.

The present invention has been invented to solve the above problems, simplifies the structure and assembly process of the permanent magnet, the support frame and the yoke, and structurally stable to maximize vibration resistance and durability to be used stably under harsh use conditions. It is an object of the present invention to provide an electric motor and a method of manufacturing the same.

In order to achieve the above object, the electric motor according to the present invention is an electric motor in which the armature coil of the armature assembly is arranged by maintaining a gap in the yoke assembly having a permanent magnet, the yoke assembly comprises: a yoke; A mold integrated field assembly disposed within the yoke; The mold integrated field assembly includes: a shielding ring fitted to an inner wall surface of the yoke; A four-pole permanent magnet coupled to the inner wall of the shield ring; The molten resin is injected while the shielding ring and the permanent magnet are combined to form a yoke molding which integrates the shielding ring and the permanent magnet by a resin.

Here, the mold-integrated field assembly may be manufactured by injection molding separately from the yoke and coupled to the yoke.

In addition, the mold-integrated field assembly is a form in which the yoke molding is formed by directly injecting a molten resin into the yoke using the yoke itself as an outer mold and coupling the inside of the yoke while the permanent magnet and the shielding ring are assembled. As the shielding ring, the permanent magnet and the yoke may have a configuration in which the yoke molding is integrated.

On the other hand, the manufacturing method of the electric motor according to the present invention, the manufacturing method of the electric motor including a yoke assembly having a yoke, a shielding ring and a permanent magnet, the process of inserting a permanent magnet into the shield ring coupled; Forcibly pressing the shielding ring into which the permanent magnet is inserted into the yoke to complete the yoke assembly; Installing a yoke temporary assembly in a template on one side; A first shaft having an outer diameter smaller than the minimum inner diameter formed by the permanent magnets coupled to the shielding ring to maintain a constant gap in the radial direction with the permanent magnet, and formed at the base of the first shaft to closely adhere to the inner diameter surface of the yoke; Inserting the other template including the second shaft into the yoke provisional assembly provided on the one template; Injecting molten resin into a resin inlet formed in the yoke to fill the gap between the first axis of the other template and the permanent magnet and a gap between the neighboring permanent magnets; Cooling and solidifying the molten resin to mold the yoke molding, thereby integrating the shielding ring, the permanent magnet and the yoke by yoke molding; And inserting an armature assembly into an inner diameter portion of the yoke molding.

According to the electric motor according to the present invention, since the shielding ring and the permanent magnet are integrated by yoke molding, there is no problem that the permanent magnet flows in the shielding ring due to vibration, and thus the power steering device of the electric vehicle and Likewise, it can withstand even the harsh conditions of continuous vibration.

In addition, as the shielding ring and the permanent magnet are provided in a pre-integrated state by the yoke molding or by the direct injection into the yoke, the assembly labor is reduced.

In addition, since the shielding ring serves as a frame supporting the permanent magnet, the number of parts can be reduced, thereby reducing parts management and transportation costs, facilitating parts procurement, and lowering manufacturing costs.

In addition, since the shielding ring is not inserted outside the yoke but inserted inside the yoke, there is no fear that the shielding ring is separated in any case, and the magnetic field of the permanent magnet is shielded by the shielding ring and does not leak to the outside. This eliminates the need for a thicker yoke and eliminates the need for additional couplings to the outside of the yoke.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Example 1)

5A, 5B, 6 and 7 illustrate a first embodiment of the present invention, in which a cross-sectional perspective view of the yoke assembly is shown in FIG. 5A and a yoke assembly according to the first embodiment of the present invention in FIG. 5B. An exploded perspective view of is shown, FIG. 6 is a cross sectional view of the yoke assembly, and FIG. 7 is a cross sectional view taken along line AA of FIG.

5A to 7, the yoke assembly 100a according to the present invention includes a yoke 110 and a mold-integrated field assembly 200a inserted into the yoke 110.

The mold integrated field assembly 200a includes a shielding ring 210 fitted to an inner wall surface of the yoke 110, a four-pole permanent magnet 220 coupled to an inner wall of the shielding ring 210, and the shielding. The molten resin is injected while the ring 210 and the permanent magnet 220 are coupled to each other, and the yoke molding 230 is integrated with the shielding ring 210 and the permanent magnet 220.

The yoke molding 230 is filled with the inner wall of the shielding ring 210 through a gap between the adjacent permanent magnets 220, as shown in FIGS. 5A to 7, and the inner wall of the permanent magnets 220. It has an inner diameter portion 231 to cover a certain thickness to maintain an air gap in the armature assembly.

In addition, the yoke molding 230, as shown in Figures 5a, 5b and 7, in order to securely secure the shielding ring 210 and the permanent magnet 220, the shielding ring 210 and the permanent magnet 220 It is preferable to comprise so that the clearance length 232 which covers the front end part (namely, the direction of the opening part of the yoke 110) of () is furthermore.

5B and 6, a groove 211 may be formed in the shielding ring 210. In the injection molding, the groove 211 is filled with molten resin to form the yoke molding 230, thereby increasing the integration strength of the three parts, that is, the shield ring 210, the permanent magnet 220, and the yoke molding 230. Is increased.

Here, the shielding ring 210 is preferably made of a nonmagnetic material in order to prevent the magnetic field of the permanent magnet 220 from leaking outside the yoke 110. In addition, the yoke molding 230 is preferably made of a nonmagnetic material and a non-magnetic material having a magnetic permeability of zero, thereby not affecting the magnetic field of the permanent magnet 220.

The mold-integrated field assembly 200a may be manufactured by injection molding separately from the yoke 110 and then fitted into the yoke 110.

Alternatively, the mold integrated field assembly 200a may be coupled to the inside of the yoke 110 in a state where the permanent magnet 220 is assembled to the shield ring 210, and then the yoke 110 itself may be an outer mold (mould). By molding the yoke molding 230 by injecting molten resin into the yoke 110, the shielding ring 210, the permanent magnet 220, and the yoke 110 may be integrated by the yoke molding 230. It can also be configured.

According to the present invention, since the shielding ring 210 and the permanent magnet 220 is integrated by the yoke molding 230, even if the vibration is applied, the problem that the permanent magnet 220 flows in the shielding ring 220 It does not occur at all and can withstand even the harsh conditions of continuous vibration such as an electric power steering device of an automobile.

In addition, since the shielding ring 210 and the permanent magnet 220 are provided in a pre-integrated state by the yoke molding 230 or are integrated by direct injection into the yoke 110, the assembly labor is reduced.

In addition, since the shielding ring 210 also serves as a frame for supporting the permanent magnet 220, the number of parts can be reduced, parts management, transportation costs can be reduced, parts procurement is easy, and manufacturing costs can be lowered.

In addition, since the shielding ring 210 is not inserted into the yoke 110 but inserted into the yoke 110, the shielding ring 210 does not have to be separated in any case. Since the magnetic field of the permanent magnet 220 is shielded by the outside and does not leak to the outside, there is no need to thicken the thickness of the yoke 110 and a separate shield ring needs to be additionally coupled to the outside of the yoke 110. Disappear.

(Example 2)

8 to 13 illustrate a yoke assembly 100b according to a second embodiment of the present invention. FIG. 8 is an exploded perspective view of the yoke assembly, and FIG. 9 is a view of FIG. 8 viewed from another direction. FIG. 10 is a perspective view of the permanent magnet coupled to the shield ring (flux ring) in FIG. 8, and FIGS. 11A and 11B are shown in the state in which the shield ring and the permanent magnet assembly of FIG. 10 are assembled to the yoke. When the resin molding is injected into the yoke using the yoke as it is, a diagram showing the shape of only the parts inside the yoke is shown, a cross-sectional view of the yoke assembly is shown in FIG. 12, and a line BB of FIG. 12 is shown in FIG. A cross section in accordance with is shown.

The mold integrated field assembly 200b according to the present embodiment is coupled to the inside of the yoke 110 in a state where the permanent magnet 320 is assembled to the shield ring 310, and then the yoke 110 itself is the outer mold (mould). As an example, the molten resin is injected into the yoke 110 to integrate the shield ring 310, the permanent magnet 320, and the yoke 110 into the yoke molding 330.

That is, in the present embodiment, the permanent magnet 320 is assembled and fixed to the shielding ring 310, and the shielding ring 310 having the permanent magnet 320 assembled is press-fitted into the yoke 110 (forcibly pressurized). Insert), and then the yoke 110 is made into the outer mold (frame), and the molten resin is injected into the yoke 110 in a state where the inner mold is inserted into the yoke molding 330 (see FIGS. 11 to 13). ), The permanent magnet 320, the shield ring 310 and the yoke 110 provides a yoke assembly 100b of the type integrated by the yoke molding 330.

8 to 10 illustrate only the components other than the yoke molding 330, that is, the shield ring 310, the permanent magnet 320, and the yoke 110.

8 to 10 illustrate the configuration for assembling the permanent magnet 320 to the shielding ring 310 in an easy and accurate position in a securely coupled state.

As shown in FIGS. 8 to 10, four pairs of guide protrusions 311 are formed at both ends of the axial direction of the shielding ring 310 to protrude radially inward while maintaining a space in the circumferential direction.

The pair of guide protrusions 311 facing each other in the circumferential direction maintains a gap suitable for the circumferential length of the permanent magnet 320.

In addition, as shown in the illustrated embodiment, when the guide protrusion 311 is configured in a form in which a part of the shield ring 310 is bent inward in the radial direction (cut and bent inward in the radial direction), the guide protrusion 311 is predetermined. It can give elasticity. According to this, the guide protrusion 311 in the state in which the permanent magnet 320 is inserted can be firmly fixed to the permanent magnet 320 by elastically pressing the side of the permanent magnet 320.

In addition, blocking protrusions 312 are formed at both ends of the shield ring 310 in the axial direction. The blocking protrusion 312 is formed in the circumferential middle portion between the pair of guide protrusions 311 to press the axial end surface of the permanent magnet 320 coupled in the shield ring 310 permanent magnet 320 This prevents deviating or shaking in the axial direction.

The blocking protrusion 312 is formed to protrude further from the axial end of the shield ring 310, as shown in Figure 10, after assembling the permanent magnet 320 and then bent inward in the radial direction permanent magnet ( Block the axial end face of 320).

The guide protrusions 311 and the blocking protrusions 312 may be implemented in various ways to maintain the spacing and convenience of assembly of the permanent magnets 320 and to maintain a strong assembly state, and the present invention is not limited to the illustrated embodiments. If the inside of the yoke 110, the permanent magnet 320 can be maintained firmly in the correct position in the shield ring 210 may be of any configuration.

In particular, when the blocking protrusion 312 is configured to be bent to extend further from the shielding ring 310, as shown in the figure, when the blocking projection 312 is assembled to the yoke 110, the bottom of the yoke 110 Since the end faces of the shielding ring 310 and the permanent magnet 320 are separated from the bottom surface of the yoke 110 by the thickness of the blocking protrusion 312 because they touch the surface, the molten resin is easily utilized by utilizing the space. It can be injected in an easy manner, and the molten resin is filled in the space to be firmly integrated.

In addition, the shielding ring 310 is formed in the circumferential cut portion 313 is cut in one of the circumference, the engaging portion 313 is formed with an engaging convex portion 314. The cutout 313 and the engaging convex portion 314 allow the shielding ring 310 to expand and contract in the circumferential direction.

In other words, if the shielding ring 310 is inserted into the yoke 110 by a forced indentation method, the shielding ring 310 may be more tightly adhered to the inside of the yoke 110. Accordingly, the cutout 313 and the engagement concave-convex portion 314 are formed in the shielding ring 310, while the diameter of the shielding ring 310 is larger than the inner diameter of the yoke 110 in a natural state in which no load is applied. After the large configuration, when the shielding ring 310 coupled to the permanent magnet 320 is forced to the inside of the yoke 110, the diameter of the shielding ring 310 within the stretch range allowed by the engaging convex portion 314 Because it is elastically reduced and press-fitted, the press-fitting process is easy, and after press-fitting, the elastic restoring force makes it possible to firmly and firmly adhere to the inner wall of the yoke 110 and maintain roundness. have.

The cutout 313 and the engaging convex portion 314 are not between the pair of opposing guide protrusions 311 supporting both sides of the permanent magnet 320, that is, between the adjacent guide protrusions 311. By forming, the portion supporting the permanent magnet 320 does not open.

Meanwhile, as shown in FIG. 9, in order to mold the yoke molding 330 by injecting molten resin into the yoke 110, a resin injection hole 111 is formed in the yoke 110.

In the embodiment shown in the figure, the resin inlet 111 is formed in plural on the bottom surface 112 of the yoke (110). There is no particular limitation on the number and position of the resin inlet 111, and the number and size and position of the resin inlet 111 are set according to the reach distance and temperature change of the molten resin.

11A and 11B, the yoke 110 is used as the outer mold in the state in which the shielding ring 310 and the permanent magnet 320 assembly are inserted into the yoke 110 as described above, and the inner mold of the axial shape is formed on the inner side thereof. When the molten resin is injected by molding through the resin inlet 111 of the bottom surface of the yoke 110 in a state of coupling), only the components inside the yoke 110 are removed.

As described with reference to FIG. 9, when the molten resin is injected into the yoke 110 through the resin injection hole 111 formed in the bottom surface 112 of the yoke 110, the molten resin is formed between the adjacent permanent magnets 320. The gap is filled up to the inner wall of the shield ring 310.

Accordingly, as illustrated in FIGS. 11A, 11B, and 12, the yoke molding 330 covers the inner wall of the permanent magnet 320 to a predetermined thickness to maintain an inner diameter portion 331 that maintains the air gap with the armature assembly. Has In addition, since the molten resin inlet 111 is also filled, the protrusion 333 is naturally formed at the tail portion. The protrusion 333 is more firmly integrated with the yoke 110.

In addition, as shown in FIGS. 11A, 11B, and 13, the front end portion of the shield ring 310 and the permanent magnet 320 (that is, in order to securely fix the shield ring 310 and the permanent magnet 320). It is preferable to configure so that the clearance length 332 which covers the opening direction of the yoke 110) is further formed.

In addition, as shown in FIG. 13, the molten resin is also formed in the gap formed between the axial end of the shield ring 310 and the inner bottom surface of the yoke 110 by the blocking protrusion 312 of the shield ring 310. By being filled, the shield ring 310, the permanent magnet 320 and the yoke 110 are firmly integrated by the yoke molding 230.

(Manufacturing method)

14A-14D show a process flow diagram for a yoke assembly manufacturing method in accordance with the present invention. This represents the process of actually manufacturing the yoke assembly according to the second embodiment described above. The same reference numerals are given to the same parts as in the second embodiment.

The injection mold, ie the mold clamping device, consists of, for example, a stationary plate 400 and a movable plate 500 as shown. The fixed plate 400 is formed with a yoke mounting groove 410 for installing the yoke 110 and a nozzle coupling hole 411 for inserting a nozzle (not shown) of an injection apparatus (not shown). It is. The nozzle coupling hole 411 communicates with the resin injection hole 111 formed in the bottom surface 112 of the yoke 110, and when the molten resin is injected through the nozzle coupling hole 411, the resin injection hole of the yoke 110 ( 111) to inject molten resin.

Meanwhile, a first shaft 451 is formed on the movable die 450, and the first shaft 451 has an outer diameter smaller than the minimum inner diameter formed by the permanent magnets 320 coupled to the shielding ring 310. It is formed to maintain a constant gap in the radial direction with the magnet 320. In addition, a second shaft 452 is formed at the base of the first shaft 451 in close contact with the inner diameter surface of the yoke 110. In addition, a third shaft 453 may be further formed at the front end of the first shaft 451. The third shaft 453 is inserted into the bearing installation groove 113 of the yoke 110 to be centered and prevents intrusion of molten resin into the installation groove 113 (see FIG. 14A).

Here, the second shaft 452 is configured in such a shape that the front end surface thereof maintains a constant distance from the end surface of the shielding ring 310, so that the molten resin is filled in the gap, so that the yoke molding 330 (Fig. The margins 332 (see FIGS. 11 and 13) of 11 to 3 are molded.

On the occasion of injection, first, the permanent magnet 320 is inserted into the shield ring 310 as shown in FIG. 14A. At this time, the blocking protrusion 312 of the shielding ring 310 is bent to block the axial end of the permanent magnet 320.

Subsequently, as shown in FIG. 14B, the shielding ring 310 into which the permanent magnet 320 is inserted is forcibly pressed into the yoke 110 to complete the yoke assembly W, and the yoke assembly W is fixed to the fixed plate. Insert into the yoke mounting groove 410 of (400).

Next, as shown in FIG. 14C, the movable die 450 is moved and inserted until the first shaft 451 touches the bottom surface of the yoke 110.

Subsequently, when molten resin is injected from a nozzle (not shown) of an injection apparatus coupled to the nozzle coupling hole 411 of the fixed mold 400, the molten resin is injected through the resin inlet 111 to move the movable mold 400. Inflow into the gap formed between the first shaft 451 and the permanent magnet 320 of the) reaches the second shaft 452, and also fills the gap between the neighboring permanent magnets 320, the shielding ring The gap between the 310 and the bottom surface of the yoke 110 is also filled.

Cooling and solidifying after the injection is completed, the yoke assembly is simplified because the shielding ring 310, the permanent magnet 320 and the yoke 110 are integrated by a solidified resin, that is, by the yoke molding 330. I can make it.

Subsequently, in the assembly process, the rotating shafts of the bearing and the armature assembly are coupled to the bearing installation groove 113 of the yoke assembly. The coil wound around the armature assembly maintains a void with the inner diameter 331 of the yoke molding 330.

As described above, in the yoke assembly according to the present invention, since the shielding ring and the permanent magnet or the shielding ring, the permanent magnet and the yoke are integrally formed by the yoke molding, only the role of the frame for supporting the permanent magnet is the shielding ring. It also serves to prevent leakage of magnetic fields, thereby reducing component count and simplifying the assembly process.

Moreover, the vibration and impact resistance of the permanent magnets are never generated in the shielding ring, and thus vibrations and impact resistance are improved, thereby continuously vibrating from the engine or the vehicle body, such as an electric power steering device of an automobile. Electric motors with excellent performance in harsh conditions are implemented.

In the above, specific embodiments of the present invention shown in the accompanying drawings have been described in detail, but these are merely illustrative of the preferred embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. In addition, the embodiments of the present invention as described above can be variously modified and equivalent other embodiments by those of ordinary skill in the art within the technical spirit of the present invention, such modifications and equivalent other embodiments are It belongs to the appended claims of the invention.

1 is a cross-sectional view showing an example of a conventional electric motor.

2 is a cross-sectional view of FIG. 1.

3 is a perspective view showing a conventional yoke assembly.

4 is an exploded perspective view of FIG. 3.

5A is a cross-sectional perspective view of the yoke assembly according to the first embodiment of the present invention.

5B is an exploded perspective view of the yoke assembly according to the first embodiment of the present invention.

6 is a cross-sectional view of the yoke assembly according to the first embodiment of the present invention.

7 is a cross-sectional view taken along the line A-A of FIG.

8 is an exploded perspective view of the yoke assembly according to the second embodiment of the present invention.

FIG. 9 is a view of FIG. 8 viewed from another direction.

FIG. 10 is an exploded perspective view of the permanent magnet coupled to the shield ring in FIGS. 8 and 9.

11A and 11B are views illustrating shapes of only parts inside the yoke when the resin molding is injected into the yoke using the yoke as it is while the shielding ring and the permanent magnet of FIG. 10 are coupled to the yoke.

12 is a cross sectional view of a yoke assembly according to a second embodiment of the present invention.

FIG. 13 is a cross-sectional view taken along line B-B of FIG. 12.

14A-14D are process flow diagrams for a yoke assembly manufacturing method in accordance with the present invention.

<Explanation of symbols for main parts of the drawings>

100a, 100b: yoke assembly 110: yoke

111: resin inlet 112: bottom surface

113: bearing mounting groove

200a, 200b: Mold Integrated Field Assembly

210, 310: shield ring 220, 320: permanent magnet

230, 330: yoke molding 231, 331: inner diameter

232, 332: clearance 311: guide projection

312: blocking protrusion 313: incision

314: engagement projections 333: projections

400: fixed template 410: yoke mounting groove

450: movable template 451: first axis

452: 2nd axis 453: 3rd axis

Claims (14)

delete An electric motor in which an armature coil of an armature assembly is disposed by maintaining a gap in a yoke assembly having a permanent magnet, The yoke assembly, With yoke; A mold-integrated field assembly disposed inside said yoke, The mold integrated field assembly, A shielding ring fitted to an inner wall of the yoke; A four-pole permanent magnet coupled to the inner wall of the shield ring; The molten resin is injected while the shielding ring and the permanent magnet are combined to form a yoke molding integrating the shielding ring and the permanent magnet by a resin, The mold-integrated field assembly is an electric motor, which is produced by injection molding integrally with the yoke separately from the yoke and assembled to the yoke. An electric motor in which an armature coil of an armature assembly is disposed by maintaining a gap in a yoke assembly having a permanent magnet, The yoke assembly, With yoke; A mold-integrated field assembly disposed inside said yoke, The mold integrated field assembly, A shielding ring fitted to an inner wall of the yoke; A four-pole permanent magnet coupled to the inner wall of the shield ring; Molten resin is injected while combining the shielding ring and the permanent magnet made of a yoke molding to integrate the shielding ring and the permanent magnet by the resin, The mold integrated field assembly is assembled inside the yoke with the permanent magnet and the shielding ring assembled, and the molten resin is directly injected into the yoke using the yoke itself as an outer mold to shield the ring, the permanent magnet, and the yoke. The yoke molding is formed in the gap of the molded, the shielding ring, the permanent magnet and the yoke are integrated by the yoke molding, An axial end of the shielding ring, the guide motor for supporting the circumferential both sides of the respective permanent magnets are formed by maintaining a distance corresponding to the circumferential length of each permanent magnet. An electric motor in which an armature coil of an armature assembly is disposed by maintaining a gap in a yoke assembly having a permanent magnet, The yoke assembly, With yoke; A mold-integrated field assembly disposed inside said yoke, The mold integrated field assembly, A shielding ring fitted to an inner wall of the yoke; A four-pole permanent magnet coupled to the inner wall of the shield ring; The molten resin is injected while the shielding ring and the permanent magnet are combined to form a yoke molding integrating the shielding ring and the permanent magnet by a resin, An axial end of the shielding ring, the guide motor for supporting the circumferential both sides of the respective permanent magnets are formed by maintaining a distance corresponding to the circumferential length of each permanent magnet. The method according to claim 3 or 4, The guide protrusion is formed by cutting a portion of the shield ring bent inward in the radial direction. An electric motor in which an armature coil of an armature assembly is disposed by maintaining a gap in a yoke assembly having a permanent magnet, The yoke assembly, With yoke; A mold-integrated field assembly disposed inside said yoke, The mold integrated field assembly, A shielding ring fitted to an inner wall of the yoke; A four-pole permanent magnet coupled to the inner wall of the shield ring; The molten resin is injected while the shielding ring and the permanent magnet are combined to form a yoke molding integrating the shielding ring and the permanent magnet by a resin, The axial end of the shielding ring, the electric motor characterized in that the blocking projection for preventing the permanent magnet from axially deviating or shaking from the shielding ring by pressing the axial end surface of the permanent magnet. The method of claim 6, The blocking protrusion is formed to protrude further extending from both ends of the axial direction of the shield ring, and assembling the permanent magnet to the shield ring and then bending it radially inward to block both end surfaces of the permanent magnet in the axial direction. An electric motor characterized by the above-mentioned. An electric motor in which an armature coil of an armature assembly is disposed by maintaining a gap in a yoke assembly having a permanent magnet, The yoke assembly, With yoke; A mold-integrated field assembly disposed inside said yoke, The mold integrated field assembly, A shielding ring fitted to an inner wall of the yoke; A four-pole permanent magnet coupled to the inner wall of the shield ring; The molten resin is injected while the shielding ring and the permanent magnet are combined to form a yoke molding integrating the shielding ring and the permanent magnet by a resin, The shielding ring is formed in the circumferential incision in one of the periphery, the engaging portion is formed in the incision, the transmission ring characterized in that the shielding ring is stretchable in the circumferential direction by the engaging portion and the uneven portion motor. The method according to any one of claims 3, 4, 6 or 8, In order to mold the yoke molding by directly injecting molten resin into the yoke, the yoke is formed with a resin injection hole is an electric motor. 10. The method of claim 9, The resin injection port is formed in plural on the bottom surface of the yoke, the electric motor. The method according to any one of claims 2, 3, 4, 6 or 8, The yoke molding has an inner diameter portion that covers the inner wall of the permanent magnet to a certain thickness and maintains a radial gap with the armature assembly. The method according to any one of claims 2, 3, 4, 6 or 8, The yoke molding further has a clearance for covering the front end portion of the shielding ring and the permanent magnet in order to securely secure the shielding ring and the permanent magnet. A method of manufacturing an electric motor comprising a yoke assembly having a yoke, a shield ring and a permanent magnet, Inserting a permanent magnet into the shielding ring to be coupled; Forcibly pressing the shielding ring into which the permanent magnet is inserted into the yoke to complete the yoke assembly; Installing a yoke temporary assembly in a template on one side; A first shaft having an outer diameter smaller than the minimum inner diameter formed by the permanent magnets coupled to the shielding ring to maintain a constant gap in the radial direction with the permanent magnet, and formed at the base of the first shaft to closely adhere to the inner diameter surface of the yoke; Inserting the other template including the second shaft into the yoke provisional assembly provided on the one template; Injecting molten resin into a resin inlet formed in the yoke to fill the gap between the first axis of the other template and the permanent magnet and a gap between the neighboring permanent magnets; Cooling and solidifying the molten resin to mold the yoke molding, thereby integrating the shielding ring, the permanent magnet and the yoke by yoke molding; And inserting an armature assembly into an inner diameter portion of the yoke molding to assemble the electric motor. The method of claim 13, The front end surface of the second shaft is spaced apart from the axial end surface of the shielding ring, and the molten resin is further filled in the gap.

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